Box-and-whisker diagram
A standard method from Measures of dispersion: the steps.
Steps
Five numbers: minimum, Q₁, median, Q₃, maximum. The box is Q₁ to Q₃; the whiskers go to the minimum and maximum.
Want to check an answer? Standard deviation calculator shows every step.
For the whole topic, read Measures of dispersion: key points, common mistakes and how the DSE tests it.